test: consolidate assertions in ipv6only test

PR-URL: #26149
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-cluster-net-listen-ipv6only-rr.js

@@ -40,9 +40,7 @@ if (cluster.isMaster) {
       if (!address) {
         address = workerAddress;
       } else {
-        assert.strictEqual(address.addressType, workerAddress.addressType);
-        assert.strictEqual(address.host, workerAddress.host);
-        assert.strictEqual(address.port, workerAddress.port);
+        assert.deepStrictEqual(workerAddress, address);
       }
       countdown.dec();
     }));